Vision Sensor SBSI/SBSC-EN, 8062650 - 1607b - 13/09/2016
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Vision Sensor Manual
For newly generated detectors, all parameters are preset as standard values, suitable for many
applications.
4.6.3.10.4.1 Optimisation:
Execution speed:
l
Search zone for position (yellow frame) only as large as necessary
Robust detection:
l
Search zone for position (yellow frame) sufficiently large?
l
Contrasts for model and image suitably set? (for model visible in sample)
l
Are thresholds set correctly?
l
Code size sufficient in the field of view?
l
Width of barcode line sufficient?
4.6.3.10.5 Barcode detector, tab Structure
Fig. 139: Detector Barcode, tab Structure
Settings in tab Structure
Parameters
Functions
Edge contrast relative
Edge contrast relative Edges inside barcode are found by setting of a threshold.
Parameter ' Edge contrast relative´ defines how this threshold in respect to
the dynamic range of the scan line pixels is calculated. In the case of
disturbances in the bar code region or a high noise level, the value of ´Edge
contrast relative´ should be increased.
Typical values: [0.05 ... 0.2]; Default: 0.05
Edge contrast absolute
Edge contrast absolute prevents misdetections of edges. For images with high
noise levels this value should be higher. In noise-free images with very weak
contrast, this parameter might disturb the detection of real edges. So it might
be necessary to reduce it or even completely disable it by setting it to 0.0.
Typical values: [0.0 ... 10.0]; Default: 5.0
Number scanlines
Number of scanlines used during the scanning of a code. Reducing the number
of scanlines improves speed.Images with higher quality need less scanlines than
images of lower quality. For an average image, a value between 2 and 5 should
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